Welding electrode



Oct. 21. 1924. 1,512,786

H. D. MORTON WELDING ELECTRODE Filed Jan. 22-, 1924 INVENTOR A TTORNE Y5 Patented Oct. 21, 1 924. x

cranes STATES v 4 1,512,786 PATENT OFEICE.

G ELECTRODE.

Zip-331163221911 died January 22, m4. Serial'lio. 901,017.

of my invention end without exceeding the.

. sec of my claims.

invention will be best understood by reference to the accompanying drawin in which I have illustrated the preferred orms for c Eng out my invention and in which Fig. lis a side view, ertially in section, of a weldins electrode illustrating an electrode em ying one form of my invention; Figs, 2, 3 endsare yiews similar to Fig. 1,

showin modificetions of my invention; and

Fig. 5 owe a device for feeding to the arc the several types of electrodes and for automat-ically applying pressure to couple the two or more separate sections shown in El 2. v

fieferrin 1 to the drawings, Fig. 1 shows one form 0 my invention wherein the weld ing strip a has formed in one end the slightly tapered recess a and has formed at its pppoeite end the slightly tapered pilot a". en the welding strip a has been partially fused, the operator inserts in the recess a the taperingly piloted end 6" of welding strip 6, having iorzned in its op osite end the slightly tapered recess 6'. T e angle of the taper of the racemes and pilots respectivel is very slight, so that a relative y sma pressure, manually applied, will cause the twofwclding strips to adhere by friction, thus forming a practically continuous supplipf weldinIg material to be fed to the arc. Fig. 2 show another form of my invention wherein the welding strip a has formedin one end the races c, and at its endthe pilot 0''. The recess a is adapted 'to recelve the pilot d" of the section d,-havinfi1f0rmcd in its 0 posits end the recess 03'. this case, the si esof the recesses and the ively are not taperedbut may straig t; The recesses are large relatively to the diameter of the 1y larger than the 'n by the tension of the s weldin stri sectio thus rodu thin collapsible uihlls sufiunding such esses. The operator inserts the i1 case 0 and either manuafiy forces the wall of the recess against the plot, as lo 9. plying pressure with pliers of suitab arm, or permits the feed rolls 7c and Z of the device of Fig. 5 to automatically force the wall of the recess a ainst the pilot. The pilots a and d may, i desired, be knurled or otherwise roughened to insure a more intimate contact between the successive welding strip sections.

In Fig. 3 I show another form of my invention wherein the welding strip section c has formed in one end the recess 6', and at its opposite end the pilot e. "he recess e is adapted to receive the pilot f" of welding strip section f, having formed in its opposite end the recess f. In this case the walls surroundin the recesses respectively are slotted, an the pilots are slightrecesses. The operator presses the pilots into the mosses of the sections. respectively, and the spring pressure 0t :1?" in the reof the walls surrounding the recesses satisfactorily connects the several sections.

Fig. 4 shows another form oi my invention wherein the welding strip sections g and h have pilots g and and it end it" formed at their ends, an are connected to- .gether by means of the short tube or ferrule 13. In this case the pilots may be taprru e ered and a correspondingly tapered is may be employed, so that the welding strip sections respectivel will be frictionally connected to the ferr e; the bore of the ferrule may he strei ht with straight and, if desired, knurle ilots on the welding strips, in which case t e walls of the ferrule may be forced against the pilots manually, as by applying pressure with pliers; or automatically by applying-pressure with the feed rolls It and Z of the device of Fig. 5; or the ferrule may be slotted at either end, so that the connection between the welding strip sections respectively and the ferrule will be by spring pressure.

Fig. 5 shows a welding rolls in and l for feeding to the are. Feed roll driven, Z is an idler the welding strip 1:. may be power headjhaving feedfeed roll, mounted upon the eccentricshaft m, and pressedwith. I

considerable force'against the welding strip rmg-o, acting up on the handle attach to the said eccening-head j is the hollow guide r, and in the lower portion of the welding-head is the hollow guide a, for maintaining the welding electrode in the proper position. The

guide 1' also serves as a means for readily positioningl successive sections of welding strip, so t at the pilot of one section will with certainty enter into or telescope with the recess of the section which is being fed and fused. In metallic arc welding the operators face is protected from the heat and the intense light of the are by a shield usually held in his hand and having in it a colored window for enabling him to observe the arc. In order to protect the eyes of the o 'erator, this colored glass must be so near y opaque that objects outside the immediate zone of the are are not clearly visible. With my invention it is only necessary that the operator note, by the sense of touch, that the outer end of the weldingstri which is being fed and fused has entered t e guide 1", and

then insert the piloted end of another weldin strip section in the guide,.which preferably has a widely-flaring o ening.

While it has heretofore the art ofv electrical casting o metals, to connect by male and female screw threads casti rods of considerable diameter, my inventlon relates to the art of metallic arc welding, wherein, are employed welding wires or strips of considerably smaller diameter. Casting rods of 6 to 15 millimeters diameter can be readily recessed and tapped in one end and piloted and threaded on the other end, it being possible to em- -ploy a relatively coarse screw thread, thus necessitating but a few turns of one casting rod with reference to the other in order to firmly couple the two together. When, however, it is sought similarly to tap and thread welding wire or strips of from to in diameter (such as are ordinaril employed in welding steel sheets of consid erable thielmes's), the screw threads must be fine, and, 1f the recess and coacting pilot. are

of sufficient length to'insure a strong joint, a large number of threads are ui One of the operators hands is usld lly occupied in holding the shield, and in some cases. the other hand is also occupied in directing the arc the proper point on the work. As. has en heretofore ointed out, the operator [is unable to clear y see the outer end of the; welding strip; and it is wellknown in the mechanical art that it is quite diflicult,

under the most favorable'condltions, to initially engage fine male and femalethreads.

Further, the welder wears heavy loves to protect his'hands and wrists, which obvien roposed, in

ties by providing means whereby, under the operating conditions which prevail in metallic arc welding, additional sections of welding wire may from time to time be quickly and with certainty connected to the section already being fed to the are, m that 'a continuous supply of welding material is made available and the arc is not interrupted, as it would be if short lengths of wire were used and not coupled together.

It has heretofore been pro, in automatic metallic arc welding, to feed from a reel a welding wire of indefinite length. lVhile this procedure gives satisfactory results in the case of welding wire of small diameters, such as %"or wires of much larger diameter are stifi and unyielding, and considerable power is required to uncoil them from the reel and feed them with oer:

tainty. If there is slippage between the feed rolls and the wire, as will occur if insuflicient pressure or power is applied, the are will vary in length, thereby producing a deleterious efiect upon the Additionall the wel ing wire should be straight as ed to the arc, and the use, in connection with an automatlc metallic are welder, of a wire-straidghtening device adds to the complications an stallation. In metallic arc welding, the work consticumbersomeness of the intutes one electrode and the weldim. wire the other electrode. In many me as when its straightened wire always involves t e waste of the portion between the work and the end which last passes through the feed rolls;

Further, the operator may find that before a particular weld is completed, he has by relatively short sections, sa 14" in length,

welding wire of diameters arger than can reached the end of such a long piece of wirei uality of the weld.'

easily be uncoiled from a reel, may, under the unfavorable conditions maintaining in metallic arc welding, be readily and with certainty coupled together to prevent interru tionofthearcandwasteoftimeandwel ing material. My invention accomplishes this result.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. In metallic arc'welding, two wel strips connected together by an unthread jo t 2. A metallic welding electrode having an nnthreaded recess at one end and-a pilot at the other end.

3. In metallic arc welding, two welding strips frictionally joined together.

4. In electrlc arc welding, a metallic electrode comprising a plurality of sections frictionally connected at their ends.

5'. In electric arc welding, a weldingstrip of indefinite length comprising a series oi sai 80 7. A metallic welding electrode having a strips of shorter length having an unthreaded. recess at one end and a pilot at the other end said pilots respectively being inserted in 6. A mec welding electrode having a tapered pilot adapted to enter a tapered recess of another electrode.

tapered recess at one end and a tapered pilot at the other end.

8. In metallic arc welding, means for feeding a welding strip to the arc, and a bellmouth guide closely adjacent to the feedin means or directing a welding strip to sai feeding means.

9. In metallic arc welding, two weldin strips in jointed relation and constructed and arranged to be operatively connected by rewure.

10. In electrode arc welding, a metallic electrode comprising a plurality of sections connected by prewure at their ends.

11. In metallic arc welding, two aligned weldin strips in telescopic relation, construc and arranged to be operatively connected together by pressure.

12. In metallic arc welding, two electrodes connected together by a joint formed by a recess in the one and a knurled pilot on the other.

13. A metallic welding electrode havin a pilot at one end and a recess surroundedfiiy a thin wall at the other end.

a welding 14. In metallic arc welding,

a reces surrounded by a electrode havin collapsible otgeafi ladiagdted to be hpremed instan r-eect eto tesame.

iibsron.

HARRY D. 

